Question

If a + b = 3 and ab = 1, what is the value of a cube + b cube + (a-b) Square?​

Answer 1

Step-by-step explanation:

It is given that,

a−b=7

let us cube on both sides, we get

(a−b)

3

=(7)

3

a

3

+b

3

−3ab(a−b)=343

133−3ab×7=343

133−21ab=343

−21ab=343−133

21ab=210

ab=−210/21

ab=−10